Institutio Oratoria

Quintilian

Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.

Similarly it has been held that we should observe distinctions such as the following: if the preposition ex is compounded with specto, there will be an s in the second syllable, while there will be no s if it is compounded with pecto.

Again the following distinction has frequently been observed: ad is spelt with a d when it is a preposition, but with a t when it is a conjunction, while cum is spelt quum when it denotes time, but cum when it denotes accompaniment.